Topic: MusicTheory.net trainers
All in Flash:
Guitar fretboard trainer
http://www.musictheory.net/trainers/html/id81_en.html
Keyboard trainer
http://www.musictheory.net/trainers/html/id80_en.html
Note trainer
http://www.musictheory.net/trainers/html/id82_en.html
Key trainer
http://www.musictheory.net/trainers/html/id83_en.html
Interval ear trainer
http://www.musictheory.net/trainers/html/id90_en.html
Scale trainer
http://www.musictheory.net/trainers/html/id91_en.html
Chord ear trainer
http://www.musictheory.net/trainers/html/id92_en.html